Power mechanism



May 31 1927' G. N. sl'MPsoN POWER MECHANISM 2 sheets-sheet) Filed June 13. 1925 lfz/ean l l??? 54.15.5077,

fw( M G. N. SIMPSON 4POWER MECHANISM Filed June 1:5, 1925 2 sheets-sheet 2 May .'31, 1927.

fiwtfien'ielas to 4initiatieiaiieSI in' V uewerfzmelienlslglend for.

illustration 11s' here s ow with, myspecatioliz i A v Ill sth-at :form 1 '.o'i-,cl wice:l Qmbflylng the. features-Of f my invent-i011, Shown ,inn the am compa-Infine drawingsflifgure'lisafveiztal -v sectionalwvliew ofa Vhoi-stwand Figure Q is` afsififniflar. view: showing a-modied-forin; l

Y ness to completely close the port 158when the valveis in the position shown 'inFigl `1. u lic A '6 is placed avcollar 160'; and between vthisV the -mechaiiism Y 311m invert' Q11 rever; inf `C2i-leed" devices tion, and .strong auch rugged. 1n (Izonystruation.V

the hoist bgeanadeto' ascendor descend asj,.desi=red.i

-iks shown vthewdrawings, 10 indicates a,"cylindenprovided rwfthgaI Vliiston 1&0 and n I p Y 'likewise causefturtheriiupwand; incitementa hollow p istonrod19.- l g o 1E f6 indicates fifa-,valvepartr-slidably l on the'piston rod 9.' The valvejpar't leads td :suitable tai-ri compressor (not shown). The lower end otthehollow piston rod 9 is provided with a hook 157. 158 indicates a port near the Alower end rof the piston rod communicating with thek lower end of the bore thereof.- The upper end o' the sliding valve part 6, is of suiiicient `thick- Y. On the piston rod 9 above the valve part collar and the valve part 6A is a spiral spring 163 exertingA a downward pressure on the valve partwith respect to the piston rod 9. The extreme upper end'of the hollow piston vrodv 9 above the piston y13() is closed by means of a plug 12.7 13 indicates la port in the piston rodV 9 just vbelowthe :pistonllSO which communicates with the bore ofthe hollow pistonrod.'

/ To the'lower end-of the cylinder 10 is attached, in anyy suitable manner, a sheave grcumeljlvrilleivisir.,

the p iiitol the e 6.; a @upward istherebyI..stanted-` o 'L'Onrfthefiende -Ofthe-'fcontlol izopefgfif-tawiliafso united; i 6' isf? provided :fain internal,fannulargrecess 151 having anV opening lcommunicating with a. flexible hose connectionll, 'which `lessen the vs reight on this" end sufiicie'ntly 's'fogthatthe spring 163 will cause f f Y `of 'the cylinder.'

tii-e v cutniiebyfthe lup-pen edge of# the 'valvelpart "to move downwardly. V'This "90 willopen the upperjend of the port-l 158,to the V*atmosphere permitting pressurein thc' cylinder below the piston. 130 `Jto .escape. The weight of thehook 157, oranywload thereon,` wil-lthen'causethe hoistto descend i.

by gravity. jAs the piston rod moves downwardly, however-,the port 4158 will again be l covered by the AValvefpa-rt 6 thus cutting` ofi E f f *escape of air rombelow the piston'l-BO andfV v "-5 holdingthe hoist stationary; It will loegloo" j seen, thereforefthat'the hoist-.will descend?, l step by step as the ropey 1'7is raised. n

- 19 indicates a: small vent? inftheupper end The lmodified lform of .device Fig. V2 is' av balanced hoist, the construction and operationof which is substantially the same as the deviceshown invftheprefe'rred yform.'` AThe differences in constructionfand" operation will be pointed out., `Correspond- 1110', i ingparts inthe modified form are indicated Y by corresponding reference numerals with linder 10 below tire; v

l shown" in 105 I "lo the' .designa-tien mi in unmodified amL the vent Y19 is 'dispensed With v'and the port 13 ieplugg-ed vup fby'means of a plugy 20; The plug 12 is dispensed-Within-Atliemodif iedV orm,the upper'end of the bore in the hollow piston-rod 9a beingle'ft open? aS indi. `cated by- 21; In the modified'forrn, al so, the v port 158a oorrespondingvto theportjlS-in ,Y thev preferred form,Y is made somewhat lower so' that When thehoist is VAinfts stationary position' as' s'hovvnv inFigg'..125r the port l158% Will ybe entirelyV covered byfthe lower part" o'ftlie'valve partv 6.' .The modified f form also has a port 22 entering Vtbe lower Aendoffthe cylinder .10? Wliichfeommunicate's by". meane v Y'of the' hose "153D to vthe air Compressor;

llien-the end ofthe rope 17a iS pulled down come throughtlie pipe 153b` to `theoylinder i, again? Covered.: Itis *ltobe understood 'that the pip'e's153a and 1531 lead to the same com# beloW Athe piston#v VGravity thenV Will 'Cause the hoistto'desoendf until 'the portIV 158a iS pressor and get theeame pressure. j"

It will beseen that in eaoh form ofadevice that Whenthe `port 158? is entirely covered, the hoist .tlieoretieallyrwill remain'rstation i 1l ary,iftlier e"is no leakage. 'If there is any leakage; thehoistv will desoend-'Slightly until (iol the port or 158f, isslightly opened or pressureto compensate for theleakage.`

It' Willbe vseentliat thelloist -is'fyery dell# cate; and that itV VvvilljV Iremain stationaryY as long as ,ith'eV controlV rope 17 is held station-4 f ary'lJ-Asy'the' "rope 17 is pulledrdo'vvnvvardlyv .r

cracked untilthere Y is'j iistienugh WhileI have -Sliovvn .and 'described fcer-V tain embodiments o flmy invention, itfisftobe Aunderstood 'that it is capable .o fjmany modif struction and f. arrangementl` 'may; be mad'e without departing from thespiritand soepenl of the invention Y` asdiselosedv fin'-- thel appended claim, in Whioliit'is my vintention to Claim all novelty inherenty in -myinventionfasi` broadly as `possible in vie'v'v of the ,prior-'fart cure by Letters Patent;A is:

, .In al device-of VthecharacterSdeSeribedjan' K- 'Vfhat Iolaimlas new,y and'` desi-re to, Vseair eylinder' having* av piston v thereinp rovide' edV Witli 'a f hollow piston-rod; avalve l part slidably mounted on thepistonfrod'; afluid pressure connection to Vsaid l valve partgaj portl in saidfpistonrod communicating Witlithe lower endrof the lbore thereinixsai'd portYr` adapted to be closed by Vsaid valve part whenV "in itsneutral1position-oneaid piston? rod, put Ainto communication with" thev'vpressure 7Ul Connection by relative upward movement of said valve partv on Said pistonmo'dia'nd f opened to the atmosphere rvby `relativedown- Ward movement of said valve'part` .on vsaid piston rod;V and-a 'communication' between the upper -Vend TO Sad :bore "andf the .interior "ofsaid @y1inder g v v v Witness maand-tails nfhaay A.4 D. i925.;

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